<!DOCTYPE html> <meta charset="utf-8"> <meta property="og:image" itemprop="image primaryImageOfPage" content="https://hajimehoshi.github.io/ebiten/images/examples/alphablending.png"> <meta name="description" content="Ebiten example - alphablending"> <link rel="shortcut icon" href="../favicon.png" type="image/png" > <link rel="icon" href="../favicon.png" type="image/png" > <title>Ebiten example - alphablending</title> <link rel="stylesheet" href="../stylesheets/bootstrap.min.css"> <link rel="stylesheet" href="../stylesheets/highlight-github.css"> <link rel="stylesheet" href="../stylesheets/ebiten.css"> <script src="../scripts/googleanalytics.js"></script> <nav class="navbar"><div class="container"> <nav class="d-flex flex-row" style="width: 100%;"> <div class="nav mr-auto"><a class="navbar-brand" href="../"><img src="../images/logo_white.svg" alt="EBITEN"></a></div> <ul class="nav"> <li class="nav-item"><a class="nav-link" href="https://github.com/hajimehoshi/ebiten">GitHub</a></li> <li class="nav-item"><a class="nav-link" href="https://godoc.org/github.com/hajimehoshi/ebiten">GoDoc</a></li> <li class="nav-item"><a class="nav-link" href="https://github.com/hajimehoshi/ebiten/wiki">Wiki</a> <li class="nav-item"><a class="nav-link" href="https://ebiten-playground.github.io/">Playground</a> </ul> </nav> </div></nav> <main><div class="container"> <h2>Ebiten example - alphablending</h2> <iframe src="alphablending.content.html" width="640" height="480"></iframe> <div class="card"><pre class="card-body"><code class="language-go">// +build example jsgo package main import ( "bytes" "image" "image/color" _ "image/png" "log" "github.com/hajimehoshi/ebiten" "github.com/hajimehoshi/ebiten/examples/resources/images" ) const ( screenWidth = 320 screenHeight = 240 ) var ( count int ebitenImage *ebiten.Image ) func update(screen *ebiten.Image) error { count++ count %= ebiten.FPS * 10 diff := float64(count) * 0.2 switch { case 480 < count: diff = 0 case 240 < count: diff = float64(480-count) * 0.2 } if ebiten.IsRunningSlowly() { return nil } screen.Fill(color.NRGBA{0x00, 0x00, 0x80, 0xff}) // Draw 100 Ebitens op := &ebiten.DrawImageOptions{} op.ColorM.Scale(1.0, 1.0, 1.0, 0.5) for i := 0; i < 10*10; i++ { op.GeoM.Reset() x := float64(i%10)*diff + 15 y := float64(i/10)*diff + 20 op.GeoM.Translate(x, y) screen.DrawImage(ebitenImage, op) } return nil } func main() { // Decode image from a byte slice instead of a file so that // this example works in any working directory. // If you want to use a file, there are some options: // 1) Use os.Open and pass the file to the image decoder. // This is a very regular way, but doesn't work on browsers. // 2) Use ebitenutil.OpenFile and pass the file to the image decoder. // This works even on browsers. // 3) Use ebitenutil.NewImageFromFile to create an ebiten.Image directly from a file. // This also works on browsers. img, _, err := image.Decode(bytes.NewReader(images.Ebiten_png)) if err != nil { log.Fatal(err) } ebitenImage, _ = ebiten.NewImageFromImage(img, ebiten.FilterDefault) if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Alpha Blending (Ebiten Demo)"); err != nil { log.Fatal(err) } } </code></pre></div> </div></main> <footer><div class="container"> <p>© 2013 Hajime Hoshi</p> <p>Code is licensed under <a href="https://github.com/hajimehoshi/ebiten/blob/master/LICENSE">the Apache License 2.0</a>.</p> <p>The content of this page is licensed under <a href="https://creativecommons.org/licenses/by/4.0/">the Creative Commons Attribution 4.0 License</a>.</p> </div></footer> <script src="../scripts/highlight.pack.js"></script> <script>hljs.initHighlightingOnLoad();</script>